!988 ford ranger 2.9 4x4 rough idle cold or warm. Changed plugs and wires checked for vacuum leaks could not find any. Just had transmission rebuilt.
2 Answers
Try checking the engine compression. Maybe you have burned valves or other problems from high miles.
Yuri_romanova answered 8 years ago
Check IAC valve. Thats what controls airflow into the engine. Also check fuel pressure.
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